Presentation - Venezuelan Operations (Details) In Millions, unless otherwise specified	12 Months Ended									3 Months Ended			12 Months Ended				3 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Financial Services [Member] USD ($)	Dec. 31, 2013 Financial Services [Member] USD ($)	Dec. 31, 2012 Financial Services [Member] USD ($)	Dec. 31, 2014 Automotive [Member] USD ($)	Dec. 31, 2013 Automotive [Member] USD ($)	Dec. 31, 2012 Automotive [Member] USD ($)	Dec. 31, 2014 VENEZUELA USD ($)	Mar. 31, 2014 VENEZUELA USD ($)	Mar. 31, 2013 VENEZUELA USD ($)	Dec. 31, 2014 VENEZUELA USD ($)	Feb. 13, 2013 VENEZUELA National Center for Foreign Commerce [Member] VEB	Feb. 12, 2013 VENEZUELA National Center for Foreign Commerce [Member] VEB	Mar. 31, 2014 VENEZUELA SICAD I [Member] VEB	Mar. 31, 2014 VENEZUELA Financial Services [Member] USD ($)	Mar. 31, 2014 VENEZUELA Automotive [Member] USD ($)
Foreign Currency Spot Exchange Rate														6.3	4.3	10.8
Highly Inflationary Economy Devaluation Translation Loss											$ 316	$ 186					$ 6	$ 310
Gain/(Loss) due to Change from Consolidated to Cost Method										(800)
Increase/(Decrease) in Cash due to Change from Consolidated to Cost Method	$ (477)	$ 0	$ 0	$ 0	$ 0	$ 0	$ (477)	$ 0	$ 0				$ (477)
Number of Years of Operation													53 years